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10.) Write a MATLAB script that will use the Pressure and Temperature columns from the provided...

10.) Write a MATLAB script that will use the Pressure and Temperature columns from the provided Excel file imported previously. Use polyfit to create a linear best fit line. Calculate the R2 value for fit. Plot both the individual data points (red) and the fit line (blue) on the same graph. Include a title and axis labels.

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Answer #1

clc
clear all
close all
format long
P=[1,5,10,15,20:5:50];
T=[300,315,330,345,360,375,390,405,420,435,450];
C=polyfit(P,T,1);
fprintf('Best fit line is T=%f*x+%f\n',C);
xx=0:0.01:50;
plot(xx,polyval(C,xx),'b',P,T,'or');
xlabel('X');
xlabel('Y');
title('Plot of f and fit');
SST=sum((T-mean(T)).^2);
SSR=sum((T-polyval(C,P)).^2);
R2=1-SSR/SST

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